Your not going to find anyone here that does a cat elimination setups. And this forum frowns upon doing it.
The ECM relies on the o2 and cat in adjusting the fuel trims and using the correct octane also is a must.
After replacing the o2 and cat (if you must) make sure the engine has a good tune up, the exhaust manifold isn't cracked, then disconnect the battery for 30 sec. This will reset the computer so it can relearn the setup with all the new parts.
If it still giving you cold start and driving problems, you might need to replace the capacitors in the ECM. The zip ty trick is used primarily on the 96-98 ZJs.
Here's the link